题目1单选题
设<img src="https://tihai-oss-cloud.itihey.com/img/cb9858002a54a141e196cbe077068354.png">是来自正态总体<img src="https://tihai-oss-cloud.itihey.com/img/76bad30cd8f8a1acadef60e08d18544f.png">的样本,则统计量<img src="https://tihai-oss-cloud.itihey.com/img/112d4d3af5d21836552a819744885856.png">服从的分布是( )A. <img src="https://tihai-oss-cloud.itihey.com/img/76bad30cd8f8a1acadef60e08d18544f.png">B. <img src="https://tihai-oss-cloud.itihey.com/img/67e544420d7589e50d7cd070b8ffc357.png">C. <img src="https://tihai-oss-cloud.itihey.com/img/f4941853aa2b148f88ca6c9217a8835d.png">D. <img src="https://tihai-oss-cloud.itihey.com/img/756e68eed3f5621b84633e8e333720fe.png">